When you first start the truck (when its cold) the motor wil go high then low like a surge or something. When it warms up about 20min or so it goes away and you wont hear it again untill another cold start.

whats wrong letting it idle. when its cold i dont shut it when its cold and its snowing i cant afford to shut it off if it wont start again i lost a few hours of work so its cheaper to let it run. i just idle up and its fine. doesnt use alot of diesel. when it was -15 degrees one night and it was idle up for 8 hours and it used 3 gallons but it was nice and toasty and the other snow pushers where trying to thaw there trucks out lol.. haha

I think he is saying that it will warm up faster once you start driving it. It should only take about 5 mins for it to warm up in cold temps before you go anywhere. I doubt he is against warming up altogether just it doesn't need that long a time to be able to drive.

The hissing sound is your EBPV closing off and the exhaust gasses hissing by it...

and definately - i said there is no "need" to let it idle 20 min to drive somewhere -- but it will stop hissing and the high idle once its warmed up or you touch the break to shift or if you're driving and go WOT.

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